6556404243 has 4 divisors (see below), whose sum is σ = 8741872328. Its totient is φ = 4370936160.

The previous prime is 6556404221. The next prime is 6556404247. The reversal of 6556404243 is 3424046556.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6556404243 - 2⁹ = 6556403731 is a prime.

It is a super-3 number, since 3×6556404243³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556404247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092734038 + ... + 1092734043.

It is an arithmetic number, because the mean of its divisors is an integer number (2185468082).

Almost surely, 2^6556404243 is an apocalyptic number.

6556404243 is a deficient number, since it is larger than the sum of its proper divisors (2185468085).

6556404243 is a wasteful number, since it uses less digits than its factorization.

6556404243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185468084.

The product of its (nonzero) digits is 345600, while the sum is 39.

The square root of 6556404243 is about 80971.6261600321. The cubic root of 6556404243 is about 1871.6382302891.

The spelling of 6556404243 in words is "six billion, five hundred fifty-six million, four hundred four thousand, two hundred forty-three".